Castell de Sant Felip (Es Castell, Spain)

found: Lagarda Mata, F. Mapes i plànols antics del Port de Maó i el Castell de Sant Felip , 2020:p. 3 (...Castell de Sant Felip, one of the most emblematic buildings in the port of Mahon)

found: Ajuntament des Castell website, 14 April 2023 :cultural tourism (Castell de Sant Felip; Castillo de San Felipe; 16th century castle, which in 1756 was considered the largest fortress in Europe; underground there is an impressive and extensive labyrinth of galleries made by the Spanish and the English during their occupations; built following the design of the Italian engineer Juan Bautista Calvi; it was a castle with four bastions joined by curtains and surrounded by a narrow and deep moat dug into the stone; later, in the 17th century, it was extended to cover the curtains by ravelins on the other side of the moat, and the complex was surrounded by a covered path, palisade and glacis; the town of Sa Raval (predecessor of the current town of Es Castell) grew on the edge of the fortress)

found: DNB via VIAF, 19 April 2023(Castillo de San Felipe--Villacarlos; variants: St. Philips Castle‏, Saint Philips Castle‎, Fort St. Philippe, La Fortaleza de San Felipe)